This is my first gun posting, so all comments will be greatly appreciated!!

The whole project revolved around making a hammer valve small cal. Plinker, with a home made 'T' valve. But in the process of designing I got side tracked and decided to make a single shot brass ‘T’ bolt action

The valve is the same setup as see around here before for use as a hammer valve with filed down bolt, nut and O-ring. The only difference is instead of using a hammer for repeater style is im just using it to dump all the air at once with the trigger. The trigger is (at the moment) just a piece of ply cut to shape which pushes directly onto the bolt of the ‘T’.

The Barrel is my favorite part and in my new project, I will be doing the same although I hope to have it looking more professional. It also separates from the valve really easily while keeping a good seal so this give’s the opportunity of barrel swaps, as everything is built in to the 1 tube/barrel (the only thing is you can only go so far cuz of valve size ) but i was thinking you could probably up scale to ¾ etc?? or will the valve be to heavy ? The actual barrel is 6mm brass tube set center inside a 20mm ally outer barrel. im using steel bearings as ammo @ 100psi.

The stock is 4 x pieces of 3 core ply sheets screwed together and cut to shape, I originally did this just for testing so I had some type of stock, but have come to really like the idea as it is fully serviceable by just removing the top layer (3 screws). In my next project I think im going to do the same but use a hard wood instead??

I’ve only had this going a couple days but It has been really accurate over 10 - 12m without even having sights, so im thinking of making a nice set of iron sights instead of using the scope?

My only 1 problem with this at the moment is im finding it hard to keep a perfect seal. It only leaks ever so slightly, although it is enough to bug me... And I have seen these working at high pressures before so anyone who has played around with these valves, any pointers would be terrific !!

Anyway I will update this real soon as I get some more done, please let me know if you have any questions or comments hope you’s enjoy !!!

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WOW. Nice stock! I like the simple valve too, but you would get better power from a piston valve. Also, you could make a hammer and trigger setup and get multiple shots.

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"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Yeah this was originally meant to be a hammer valve but got side tracked at some stage, but now im starting to like the idea of a trigger like the cap gun idea or even maybe a nail gun?

Ok, fair enough!

I have already had a piston valve, but this has still got a lot of power (for what it is ) while still being able to keep a realistic look and setup

Yes, do do seem to have quite a bit of power with that thing! Nice work!

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"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Thanks everyone for your kind words, makes me want to do more ... even Brings a tear to my eye

I've Started my new Stock which is similar to this one but haven't cut anything for the internals yet as i would like to change the valve..

I don't think it is very efficient, great for dumping, but i don’t think I would be efficient enough for a hammer valve & the button is a little hard to push which gives the trigger a real spongy feeling

So i was thinking of changing the valve so it has a smaller diameter stem and head (hoping this will bring the weight down some) maybe even casting a traditional hammer valve out of Reinforced epoxy ?? (JSR ) so any advice on that would be most appreciated!!

Great stuff man!!!!, I like it mate = a nice clip of the beast shooting would be nice although I cant talk,ive not been able to do footage of my semi auto in action. Im going to try borrow my brother camera and get some footage done, its one thing to see a nice homemade airgun but see it also in action speaks a thousand words.

Keep up the good work, nice to see another fellow countryman making his own guns

I quite like the idea of that trigger setup, but i have to ask, will pulling the trigger slow affect its effectivness?? And how stiff is the trigger?P.s. Sry for any spelling errors ad missing/extra chars... I am on my phone:p

i have to ask, will pulling the trigger slow affect its effectivness??

I would assume so, the other advantage of a hammer valve over this design (besides multiple shots) is that you get fairly consistent shots, which is very important if you need accuracy. I believe the answer to your question is yes, the faster you pull the trigger, the more powerful the shot.

And how stiff is the trigger?

He already answered that.

the button is a little hard to push which gives the trigger a real spongy feeling

...DAMMIT!!! you've inspired me!! Now I'm considering making a very similar one from spare parts. I should have most it not all the parts i need for a basic project like this. The thing I love with this design is that it is so effing simple, and yet it is still practical and somewhat powerful. I wanna build this before I build my secret project...

My only 1 problem with this at the moment is im finding it hard to keep a perfect seal. It only leaks ever so slightly, although it is enough to bug me... And I have seen these working at high pressures before so anyone who has played around with these valves, any pointers would be terrific !!

Try using a piece of tire inner-tube for the seal instead of an o-ring (that's what you're using right now right?). I have used inner tube for 400 psi and it works great! I just have a huge piece of it from my dad's 1950s truck that I can use. I just keep it a little lubricated with some petroleum jelly to keep a perfect seal. I left the air in there (at 200 psi) for an hour and none had leaked out, so it seems to work for me! Also, you might wanna consider staining and varnishing that stock for a nicer look. Great job so far! Good luck, and I look forward to seeing your future projects! Btw, did you lathe the valve stem? It looks like you may have done that with a powerdrill? (Nothing wrong with that, just wondering)

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"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

hey all sorry it's been a while my computer shat a power supply but im back now

chinnerz wrote: have to ask, will pulling the trigger slow affect its effectivness?? And how stiff is the trigger?

Yea pulling the trigger slowly does really affect the effectivness and power which is a little bit of a same when your trying to target shoot and be accurate but after a while you get use to it (fine for shooting cans and such ), and yes it is hard but i've found i tighten the spring it seems to fire better ??? i know stop looking at me like that lol i think cuz you don;t have so far to push the valve , if that makes any sence ???

maverik94 wrote:...DAMMIT!!! you've inspired me!! Now I'm considering making a very similar one from spare parts. I should have most it not all the parts i need for a basic project like this. The thing I love with this design is that it is so effing simple, and yet it is still practical and somewhat powerful.

Yeah man please !!! i would be really excited to see what other people can do with this, i think if someone was to run with it they could do a much better job than i have of it !!

Btw, did you lathe the valve stem? It looks like you may have done that with a powerdrill? (Nothing wrong with that, just wondering)

Yeah mate use the good old Bench drill lathe works a treat with a couple files and some sandpaper

I've mounted a scope and played with the valve and started to clean it up , have decided now to keep it as it is but finish it and make it look good , i also started a blow forward bolt for this body which i have tested and am now just waiting for my plastic to arrive (to0 make the final version), so i'll get some pic's up when i can ..

thanks guys

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Last edited by Patto on Wed Mar 03, 2010 1:24 am, edited 1 time in total.

it wouldn't be difficult to improve that.... you just need something that works like a poppet valve. Poppet valves are too some extent like QEVs... once you open them a little bit the pressure does the rest of the job for you